CAPITAL STOCK- SUMMARY OF INFORMATION BY EXERCISE PRICE RANGE (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
$6.23 - $12.78
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding at December 31, 2020 | shares	86,166
Weighted Average Remaining Contractual Life in Years	2 years 2 months 12 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 7.59
Number of Options Exercisable at December 31, 2020 | shares	86,166
Weighted Average Remaining Contractual Life in Years	2 years 2 months 12 days
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 7.59
Exercise price, lower range limit	4.50
Exercise price, upper range limit	$ 7.36
$12.79 - $39.76
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding at December 31, 2020 | shares	63,197
Weighted Average Remaining Contractual Life in Years	4 years 6 months 25 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 30.11
Number of Options Exercisable at December 31, 2020 | shares	63,197
Weighted Average Remaining Contractual Life in Years	4 years 6 months 25 days
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 30.11
Exercise price, lower range limit	7.37
Exercise price, upper range limit	$ 32.21
$39.77 - $60.94
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding at December 31, 2020 | shares	65,000
Weighted Average Remaining Contractual Life in Years	9 years 3 months 14 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 60.94
Number of Options Exercisable at December 31, 2020 | shares	0
Weighted Average Remaining Contractual Life in Years	0 years
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 0
Exercise price, lower range limit	32.22
Exercise price, upper range limit	$ 62.50
$60.95 - $71.84
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding at December 31, 2020 | shares	120,666
Weighted Average Remaining Contractual Life in Years	7 years 7 months 2 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 70.21
Number of Options Exercisable at December 31, 2020 | shares	71,334
Weighted Average Remaining Contractual Life in Years	7 years 5 months 19 days
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 70.03
Exercise price, lower range limit	62.51
Exercise price, upper range limit	$ 69.77
$71.85 - $108.25
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding at December 31, 2020 | shares	129,203
Weighted Average Remaining Contractual Life in Years	7 years 9 months 25 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 89.45
Number of Options Exercisable at December 31, 2020 | shares	70,637
Weighted Average Remaining Contractual Life in Years	6 years 10 months 20 days
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 84.98
Exercise price, lower range limit	69.78
Exercise price, upper range limit	$ 108.25
$6.23 - $108.25
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding at December 31, 2020 | shares	464,232
Weighted Average Remaining Contractual Life in Years	6 years 5 months 23 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 57.18
Number of Options Exercisable at December 31, 2020 | shares	291,334
Weighted Average Remaining Contractual Life in Years	5 years 1 month 20 days
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 46.53
Exercise price, lower range limit	4.50
Exercise price, upper range limit	$ 108.25